Foot-valve.



No. 743,006. PATENTED NOV. 3, 1903; J. G. LOUGKS.

FOOT VALVE.

APPLICATION FILED JUNE 29, 1903.

N0 MODEL.

Fig.1.

WITNESSES: INVENTOR.

m: noams warms c0. wufaumou WASHIhuTDN. u c.

UNITED STATES Patented November 3, 1903.

PATENT OFFICE.

JAMES C. LOUCKS, OF GRAND RAPIDS, MICHIGAN, ASSIGNOR OF ONE-HALF TO THOMAS F. DONAI-IUE, OFGRAND RAPIDS, MICHIGAN.

FOOT-VALVE.

SPECIFICATION forming part of Letters Patent No. 743,00 dated November 1903- Application filed June 29, 1903- To aZZ whom it may concern.-

Be it known that I, JAMES C. LoUoKs, a citizen of the United States, residing at Grand Rapids, in the county of Kent and State of 5 Michigan, have invented certain new and useful Improvements in Foot-Valves; and 1 do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which IO it appertains to make and use the same.

My invention relates to improvements in foot-valves, and its object is to provide means for readily clearing the strainer from any obstructions that may have accumulated there-' IS on; and it consists in the combination and arrangement, with the valve, of a supplementary valve opening oppositely to the checkvalve of the device and provided with a yielding support to retain this supplementary valve in closed position under ordinary pressures and to yield and permit the valve to open and the fluid retained by the foot-valve to flow backward and through the strainer, and thus clear the strainer from any obstructions that may have accumulated thereon, as

will more fully appear by reference to the accompanying drawings, in which- Figure 1 is a vertical section of a device embodying my invention; Fig. 2, a side ele- 0 vation of the same with the parts broken away to show the construction and showing the operation when acting to clear the strainer, and Fig. 3 a plan view of the supplementary valve-seat.

5 Like letters refer to like parts in all of the figures.

A represents the packing of the main valve, and B the plate of the same. These are made annular,and thus provided with a suitable 4o central opening, which opening is closed by an auxiliary Valve D, provided with packing G. This auxiliary valve is supported by a suitable valve-seat of the form indicated in Fig. 3, and on the stem of the valve D, which passes through the cross-bar of this valveseat, is a suitable head E, and a spring F is interposed between this head and the crossbar of the valve-seat, whereby the valve D is supported in contact with the seat under serial No. 163,523. (No model.)

, the ordinary back pressure upon the valve A.

As long as this pressure is not in excess, the valve D remains closed, and the valve A operates in the usual manner.

' H represents the valve-casing, of the usual construction and provided below the valve with the usual screen I. Whenever this screen becomes clogged for any reason, any suitable means of increasing the back pressure on the valve A will at once open the valve D, and the fluid above the valves will then flow backward, as indicated by the arrows in Fig. 2, and thus its reverse movement through the strainer will clear the same of any obstructions that may have accumulated thereon.

It is obvious that various modifications of structure may be adopted without departing from my invention. I therefore do not limit myself to the precise construction shown.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is-- 1. In a foot-Valve,in combination with the case, a strainer, and a valve; an auxiliary valve opening toward the strainer, and a spring to hold the saidvalve closed against the pressure on the first-named valve.

2. In a foot-valve, the combination of a case, a strainer, an annular valve opening away from the strainer, a-valve opening toward the strainer, and closing the opening in the first-named valve, and a spring to hold the second-named valve closed.

3. In a foot-valve, the combination of a case, a strainer, an annular valve opening away from the strainer, a valve-seat on the under side of said valve and havinga crossbar, an auxiliary valve engaging the valveseat, and having an upwardly projecting stem provided with a head, a spring surrounding the stem and engaging the head, and the go cross-bar of the valve-seat to hold the valve closed.

In testimony whereof I affix my signature in presence of two witnesses.

' JAMES C. LOUOKS.

Witnesses: v

LUTHER V. 'MOULTON, GEORGIANA CHACE. 

